require( './main.css')
const {toLowerCase} = require('./b')
const a = 'Hello gch'
console.log(toLowerCase(a))
let oDIV = document.createElement('div')
oDIV.textContent = '我真棒,嘿嘿嘿'
document.body.appendChild(
   oDIV
)
module.exports = a;// commonjs